THE MARINE BOTANIST. 175 



head. Frond from two to six inches high, narrow 

 at the base, then widening*, and soon dividing- in a 

 palmate manner, regularly forked, the tips of the 

 segments notched and rounded. When producing 

 spores, the centre of each division becomes thick- 

 ened into a raised line resembling a midrib, but 

 not continuous through the frond, generally break- 

 ing off opposite a forking ^ the tetraspores which I 

 discovered on Min head specimens in 1848, form 

 round, conspicuous, well-defined spots (sori) scat- 

 tered over the frond nearly of the same size and 

 shape as the spots of tetraspores in Chondrus 

 crispus. The colour in Minehead plants is very 

 like that of Ehodymenia laciniata, while the sub- 

 stance and feel of the frond more nearly resembles 

 young plants of B, palmata. It adheres but im- 

 perfectly to paper. Plymouth specimens which I 

 have seen are more fan-shaped than mine, and the 

 texture appears thinner, and colour a lighter red. On 

 this beach I find it floated ashore from June to 

 the end of December, and even as late as March 

 I have collected specimens. From August to 



